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GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
For a binary half-sub-tractor having two inputs A and B, the correct set of logical expressions for the outputs D (=A minus B) and X (=borrow) are
A
$$D = \,AB + \overline A \,B,\,X = \overline A \,B$$
B
$$D = \,\overline A \,B + A\overline B + A\overline B ,\,X = A\overline B $$
C
$$D = \,\overline A \,B + A\overline B ,\,X = \overline A \,B$$
D
$$D = \,AB + \overline A \,\overline B ,\,X = A\overline B $$
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